1. Standard 

ASTM Standard：ASTM B729

2. Chemical Composition

Elements	C	Mn	P	S	Si	Cr	Mo	Ni	Cu	Nb+Ta	Fe
Min						19.0	2.0	32.0	3.00	8C
Max	0.07	2.00	0.045	0.035	1.00	21.0	3.0	38.0	4.00	1.0	remainder
Actual value	0.05	0.47	0.011	0.0013	0.20	20.13	2.41	33.02	3.77	0.68	38.74

 3. Mechanical Properties

Mechanical Properties	Tensile Strength MPa	Yield Strength MPa	Elongation %
Min	550	240	30
Max
Actual value	685	397	35

 4. Typical Size

Size	Outside Diameter mm	Permissible Variations in Outside Diameter mm	Wall mm	Average Wall Permissible Variations in Wall Thickness
60.3×3.91	60.3	±0.25	3.91	±10%S

5.  Typical Application Environment

       This metal material has excellent anti-stress corrosion cracking ability and good corrosion resistance to local reducing compound medium corrosion. It is used in sulfuric acid  working condition or used for  industrial equipment of sulfuric acid solution containing halogen ions and metal ions.